package com.xian.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;


//@WebFilter(urlPatterns = "/*")  //拦截所有请求
public class DemoFilter implements Filter {
    @Override  //初始化方法，只调用一次
    public void init(FilterConfig filterConfig) throws ServletException {
//        Filter.super.init(filterConfig);
        System.out.println("inin.......");
    }

    @Override  //拦截到请求后调用，调用多次
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("拦截到了请求.......放行前逻辑");
        //放行
        filterChain.doFilter(servletRequest,servletResponse);

        System.out.println("拦截到了请求.......放行后逻辑");
    }

    @Override  //销毁方法，只调用一次
    public void destroy() {
//        Filter.super.destroy();
        System.out.println("destroy.......");
    }
}
